Answer:
Third option (order: n,-a,0,a,-n)
Explanation:
We're told a<-n (a is less than -n), which means a should be before -n in the number line
Multiply a<-n by -1, and we get -a >n (inequality sign flips when multiplying by a negative) or -a is greater than n, which means -a should go after n in the number line
Since '-a' and 'a' are equal in magnitude just not in sign, both '-a' and 'a' should be the same distance from 0 on either side of the number line. Same for n and -n.
The only option that satisfies all the above conditions is the third one (order: n,-a,0,a,-n)